Circular saw.



No. 697,857. Patented Apr. l5, I902.

B. LEITMAYR.

CIRCULAR SAW.

(Application filed Apr. 5, 1900.)

3 Sheets-Sheet I.

(No Model.)

No. 697,857. Patented Apr. [5, I902.

B. LEITMAYR.

CIRCULAR SAW.

(Application filed Apr. 5, 1900.1

'3 Sheets-Sheet 2.

(No Model.)

No. 697,857. Patented Apr. I5, I902.

B. LEiTMAYR.

CIRCULAR SAW;

(Application filed Apr. 5, 1900.)

3 Sheets$heet 3.

(No Model.)

m: NORRIS Firms c0, vnoro-u'mo, wAsn muToN. n. c.

ntent OFFICE.

BERNHARD LEITMAYR, OF MOLLN, AUSTRIA-HUNGARY.

CIRCULAR SAW.

SPECIFICATION forming part of Letters Patent No. 697,857, dated April15, 1902.

Application filed April 5, 1900. Serial No. 11.770. (Noanodeh) To (0%whom it may concern:

Be it known that I, BERNHARD LEITMAYR, asubject of the Emperor ofAustria-Hungary, residing at Molln, -in the Province of Upper Austria,in the Empire of Austria-Hungary, have invented certain new and usefulImprovements in Circular Saws; and I do hereby declare the following tobe a full, clear, and exact description of the invention,such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and toletters and figures of reference marked thereon, which form a part ofthis specification.

This invention relates toa circular saw for cutting thin laths orstrips, such as those used for making rules, scales, and the like, inwhich the forward and backward feeding of the work in the direction ofthe cut, the adjustment of the same against a gage or guide after thecutting off of a lath or strip, as well as the arresting of the feedmechanism after the cutting 0d of the last lath or strip, are effectedautomatically.

My improved circular saw is shown in the accompanying drawings, in whichFigure 1 is a plan of the improved saw with the feed carriage or slidemoved back beyond the middle position. Fig. 2 is a longitudinal sectionon the line A B, Fig. 1, wherein the mechanism for moving the slide isshown with the clutch for feeding the slide forward in gear. Fig. 3 is atransverse section on the line C D, Fig. 1, through the drivingmechanism for the slide. Fig. 4 is a transverse section on the line E F,Fig. 1. Fig. 5 is a side view of the means to cam the block of wood fromthe saw during the return of the carriage. Fig. 6 is an end view of thesame, and Fig. 7 is a perspective view showing how the lever holds theclutch out of engagement.

As will be seen, a bed I) is arranged on the base-plate a, on which beda slide 6 can move directly over the table 0 of the circular saw (Z.This carriage or slide 6 bears at its front end a bar f, with anadjustable stop 9, between which stop and the front end of the slide isplaced the board or slab h to be cut into laths or strips. The board his pressed by means of springs z and j, mounted on the carriage or slide6, at one side against the surface of the table and at the other sideagainst a gage or guide Z, secured to a flange or ledge 75 on the table.By the distance of the gage Z from the plane of the circular saw isdetermined the thickness of the lath or strip m to be out off, Figs. 4and 6. The reciprocating motion of the slide 6 is effected by means of ashaft 1), which is rotated with retarded velocity by a motion-shaftn andthe Worm-gear 0. On the shaft 19 are mounted a movable clutch member 1,acted upon by the spring 1 and rotating with the shaft, and a loosespur-Wheel s. This spur-Wheel, which engages with a rack t on the slide,is provided on its flat side with a number of laterallyprojecting teeth2 and also with a cord-groove 3, in which is secured one end of a cord4, the other end of the said cord bearing a weight it. A lever to ispivotally mounted at 5 on the base-plate a, and the forked front end ofthis lever engages with a flange 6 onthe movable clutch member 7',against which it is pressed by the short arm 7 of a weighted lever 00,pivotally mounted at the under side of the base-plate, while the rearend of the lever 10 bears an adjustable projection S, which is actedupon by a roller 9 on the slide.

In order to arrest the motion of the lever to, the base-plate also bearsa pivoted lever 31, Fig. 1, acted upon by a spring and having aprojection 10 and an upwardly-extending arm 11, on which acts anadjustable projection 12 on the slide.

A stop 19, formed on a rod 20, Fig. 2, and projectingfrom the table,isactuated by means of projections 17 and 18, adj ustably mounted on theslide, and this rod 20 is connected with cam-fingers 21 2l,which canmove near the fiat surface of the circular saw. These camfingers servefor pushingthe board or slab to one side in the return motion thereofaway from the saw, so that the cut surface is not damaged by the saw-z.6., a clean smooth cut surface is obtained.

The permanent throwing out of gear of the clutch for the purpose ofstopping the slide is effected by means of a hand-lever z, pivotallymounted on the base-plate. The arm 13 of this lever extends up to theflange 6 of the clutch member 4, and the said lever is actuated by anadjustable projection 14, on which a lever 15, pivoted to the slide,presses as soon as the pin 16 of this lever comes into engagement withthe springj.

The operation of my improved saw is as follows: Assuming that thecarriage or slide 6 is in its extreme right-hand position, in which thespringt is raised somewhat by the passage of its projection 23, Fig. 1,on to the inclined projection 24:, so that the board or slab 72 can bepressed unimpeded against the gage l by means of the spring j. Thespringt' comes into operation again immediately the slide beginsitstravel. In the extreme right-hand position of the slide the roller 9engages with the wedge-shaped projection S on the lever 10, so as tooscillate the said lever and raise the weighted lever 50. While thelever 10 is arrested by the passage of the projection 10 on the lever ybehind the bar 22 the movable clutch member 7' effects the coupling ofthe driving-shaft p with the spur-wheel s, in which operation the saidclutch member snaps between the teeth 2 of the spur-wheel by thepressure of the spring 1. The toothed Wheel is rotated by means of thesaid clutch member and the weighted cord thus simultaneously Wound up,whereby the slide is moved forward, so as to feed the work against thesaw, in which operation the lath or strip m is pressed somewhat to oneside during the cut by means of a curved spring 25, Fig. 1. When a lathm, Fig. 4, has been out off, the arrangement for laterally lifting awaythe work is actuated by the engagement of the projection 18 with theprojection 19, and at the same time the latch y is moved laterally bythe engagement of the projection 12 with the arm 11 of the said lever,whereby the projection 10 on the said lever is caused to release the bar22. The lever 20, being now released, throws the clutch member 4' out ofgear under the action of the weighted lever ac and at the same time putsthe spring 1 under compression. By the action of the weight a thespurwheel .9 is turned in the opposite direction and the slide movedback, during which operation the arrangement 21 for laterally liftingthe work is thrown out of gear by means of the projection 17, and thelever w is actuated again.

The above-described operations are repeated until the last lath or stripis cut, after which the action of the slide is automatically stopped.This automatic stopping of the slide e is effected as follows: After thecutting ofi of the last strip the inwardly-bent spring j presses on thepin 16 of the lever 15, whereby the projection 14 is pushed out of theslide. If now the slide moves .back, the projection 14 presses againstthe lever 2, whereby the latter is moved toward the right, and its arm13 comes in front of the flange 6 on the movable clutch member which isout of gear, and thus prevents the latterfrom being agairrreleased.After the introduction of a fresh board or slab the projection 14 ispushed back by hand and the lever z moved to the left,

whereby the arm 13 moves away from the flange on the clutch member 0",and the latter can be again thrown into gear.

I claim 1. In a machine of the class described, the combination with asuitable table, a saw and a carriage reciprocable on the table, ofdevices mounted independently of the carriage and operated thereby toengage and shift the work from the saw, substantially as described.

2. In a machine of the class described, the combination with a suitabletable, a saw and a carriage reciprocable on the table, of devices toexert pressure on and hold the work in position to be cut by the saw,and devices independent of and operated by the carriage to engage andshift the work from the saw against the action of the holding devices,substantially as described.

3. In a machine of the class described, the combination with a suitabletable and saw, of a reciprocable carriage, a guide to regulate thethickness of material to be cut, means for holding the material againstsaid guide, a device for holding it down on the table and a stopmechanism for said carriage arranged to be operated by said means tostop the carriage, substantially as described.

l. In a machine of the class described, the combination with a suitabletable and saw, of a reciprocable carriage, a guide, means for holdingthe material to be out against said guide, a device for holding thematerial down on the table, mechanism for shifting the material from thesaw at the end of each cut and operated by the carriage and a stopmechanism arranged to be operated by the means for holding the materialagainst the guide when substantially all of the material has been cut inorder to stop said carriage, substantially as described.

5. In a machine of the class described, a reciprocable carriage, a rackthereon, a gearwheel arranged to engage the rack to drive the carriageforward, a shaft, a clutch on the shaft arranged to engage saidgear-wheel, a

clutch-operating mechanism arranged to antomatically disconnect saidshaft and wheel,

a weight arranged to return the carriage to position to start itsforward travel, a spring to hold the work, a lever to hold the clutchout of engagement and a projection 14 moved by said spring to move thelever to stop the nently disengaged, substantially as described.

7. In a machine of the class described, a re-- IIO ciprocable carriage,a rack thereon, a drivingshaft, a springactuated clutch thereon, agear-Wheel engaging the rack and arranged to be coupled to the shaft bysaid clutch, a weighted bell-crank lever arranged to move the clutchagainst the stress of its spring, a second lever operated from thecarriage arranged to displace the bell-crank lever to allow the clutchto engage the gear-wheel and to disengage it again at the end of theforward travel of the carriage and means for causing the return travelof said table, substantially as described.

8. In a machine of the class described, a reciprocable carriage, and arack and gear- Wheel for moving it forward, a driven springheld clutcharranged to engage said wheel, a lever acting on the clutch, a Weightedbellcrank lever acting on the latter, means at one end of the carriageto engage the first-mentioned lever to allow the engagement of clutchand wheel, a latch to lock the firstmentioned one when moved, and adevice on the carriage, whereby said latch is moved to allow theweighted bell-crank lever to act on the first-mentioned one to move theclutch out of engagement with the Wheel and against the stress of itsspring, substantially as described.

9. In a machine of the class described, the combination with a table, areciprocable carriage thereon, a saw and mechanism to reciprocate thecarriage, of cam-fingers connected together, a rod to simultaneouslymove them, a stop on the carriage to move said rod at substantially theend of its forward travel to rotate the cam-fingers into the kerf tomove the uncut Work transversely of the carriage,

substantially as described.

In testimony that I claim the foregoingas my invention I have signed myname in presence of two subscribing witnesses.

BERNHARD LEITMAYR.

Witnesses:

Josnn RUBARCH, AUGUST FUGGER.

